Course outline
Module 1
Module 1: What Hormones Are and How They Work
What Hormones Are and How They Work
Knowledge check
Q1. What are hormones primarily described as?
- A. Structural proteins that build cell membranes
- B. Chemical messengers that travel through the bloodstream to regulate distant target cells ✓
- C. Enzymes that break down food in the digestive tract
- D. Electrical signals transmitted along nerve fibers
Why: Hormones are chemical messengers released into the blood, where they travel to target cells and tissues that have specific receptors to respond to them.
Q2. Which gland is often called the 'master gland' because it controls many other endocrine glands?
- A. Thyroid gland
- B. Adrenal gland
- C. Pituitary gland ✓
- D. Pancreas
Why: The pituitary gland releases hormones that stimulate or regulate several other endocrine glands, including the thyroid and adrenal glands, which is why it is called the master gland.
Q3. How do hormones produce their effects on target cells?
- A. By physically destroying the target cell
- B. By binding to specific receptors on or inside the target cell ✓
- C. By being absorbed directly into the cell's DNA without any binding
- D. By generating electrical impulses in the target cell
Why: Target cells have receptors that are shaped to bind specific hormones, and this binding triggers a cascade of changes inside the cell that alter its activity.
Q4. What is the endocrine system?
- A. A network of blood vessels that carry oxygen
- B. A collection of glands that secrete hormones directly into the bloodstream ✓
- C. A group of muscles that control body movement
- D. A system of ducts that carry sweat and saliva
Why: The endocrine system consists of ductless glands that release hormones directly into the blood, distinguishing it from exocrine glands that use ducts.
Q5. Which describes a negative feedback loop in hormone regulation?
- A. A hormone increases its own production without limit
- B. A hormone's effect reduces further release of that hormone once a set point is reached ✓
- C. A hormone is released only when the body is asleep
- D. A hormone is destroyed immediately after it is produced
Why: In negative feedback, the output of a process inhibits its own continued production, keeping hormone levels within a healthy range, as seen with thyroid hormone regulation.
Module 2
Module 2: The Endocrine System: Glands and Messengers
The Endocrine System: Glands and Messengers
Knowledge check
Q1. Which gland is often called the 'master gland' because it controls many other endocrine glands?
- A. Thyroid gland
- B. Pituitary gland ✓
- C. Adrenal gland
- D. Pancreas
Why: The pituitary gland releases hormones that regulate the activity of many other endocrine glands, including the thyroid and adrenal glands, which is why it is called the master gland.
Q2. What is the main role of hormones in the body?
- A. To physically break down food into nutrients
- B. To carry chemical messages that regulate body functions ✓
- C. To produce red blood cells in the bone marrow
- D. To contract muscles during movement
Why: Hormones are chemical messengers released into the bloodstream that travel to target cells and regulate processes such as growth, metabolism, and mood.
Q3. Which hormone is produced by the pancreas to help lower blood sugar levels?
- A. Glucagon
- B. Adrenaline
- C. Insulin ✓
- D. Thyroxine
Why: Insulin is released by the beta cells of the pancreas after eating, signaling cells to absorb glucose from the blood and lowering blood sugar levels.
Q4. Which gland is located in the neck and produces hormones that regulate metabolism?
- A. Parathyroid gland
- B. Thymus gland
- C. Thyroid gland ✓
- D. Pineal gland
Why: The thyroid gland, located in the front of the neck, produces thyroxine (T4) and triiodothyronine (T3), which control the body's metabolic rate.
Q5. Which adrenal hormone is responsible for the 'fight or flight' response?
- A. Melatonin
- B. Estrogen
- C. Adrenaline ✓
- D. Growth hormone
Why: Adrenaline (epinephrine), released from the adrenal medulla, increases heart rate, breathing, and blood flow to muscles, preparing the body to respond to stress or danger.
Module 3
Module 3: Hormones and Metabolism
Hormones and Metabolism
Knowledge check
Q1. Which gland is often called the 'master gland' because it controls the release of hormones from several other endocrine glands?
- A. Thyroid gland
- B. Pituitary gland ✓
- C. Adrenal gland
- D. Pancreas
Why: The pituitary gland, located at the base of the brain, releases hormones such as TSH and ACTH that stimulate other endocrine glands, which is why it is called the master gland.
Q2. Which hormone is produced by the beta cells of the pancreas and helps lower blood glucose levels?
- A. Glucagon
- B. Cortisol
- C. Insulin ✓
- D. Thyroxine
Why: Insulin is released by pancreatic beta cells when blood glucose rises. It promotes glucose uptake into cells and storage as glycogen, lowering blood sugar.
Q3. What is the primary role of glucagon in metabolism?
- A. To store excess glucose as fat
- B. To raise blood glucose by stimulating the liver to release stored glucose ✓
- C. To increase the rate of protein synthesis in muscle
- D. To decrease the body's basal metabolic rate
Why: Glucagon, released by pancreatic alpha cells when blood sugar is low, signals the liver to break down glycogen into glucose and release it into the bloodstream.
Q4. Which hormone, produced by the thyroid gland, plays a major role in regulating the body's basal metabolic rate?
- A. Melatonin
- B. Estrogen
- C. Thyroxine (T4) and triiodothyronine (T3) ✓
- D. Oxytocin
Why: Thyroid hormones T4 and T3 increase the rate at which cells use energy, so they are key regulators of basal metabolic rate and overall energy use.
Q5. Which adrenal hormone is released in response to stress and helps mobilize glucose and fatty acids for energy?
- A. Aldosterone
- B. Adrenaline (epinephrine)
- C. Cortisol ✓
- D. Insulin
Why: Cortisol, a glucocorticoid released from the adrenal cortex during stress, increases blood glucose through gluconeogenesis and promotes fat and protein breakdown for energy.
Module 4
Module 4: Stress, Cortisol, and the Body
Stress, Cortisol, and the Body
Knowledge check
Q1. Which gland is primarily responsible for producing cortisol, the main stress hormone?
- A. Thyroid gland
- B. Adrenal cortex ✓
- C. Pituitary gland
- D. Pancreas
Why: Cortisol is a steroid hormone produced in the outer layer (cortex) of the adrenal glands, which sit on top of the kidneys. The thyroid regulates metabolism, the pituitary acts as a master signaling gland, and the pancreas controls blood sugar through insulin and glucagon.
Q2. What is the name of the body's central stress response system that controls cortisol release?
- A. Parasympathetic nervous system
- B. Hypothalamic-pituitary-adrenal (HPA) axis ✓
- C. Renin-angiotensin system
- D. Gastrointestinal hormone network
Why: The HPA axis links the hypothalamus, pituitary gland, and adrenal glands. When stress is perceived, the hypothalamus releases CRH, which prompts the pituitary to release ACTH, which then stimulates the adrenal cortex to produce cortisol.
Q3. Which of the following is a common short-term effect of elevated cortisol during a stressful event?
- A. Decreased blood sugar levels
- B. Slowed heart rate
- C. Increased blood glucose availability ✓
- D. Reduced alertness
Why: Cortisol helps mobilize energy by promoting gluconeogenesis and the release of glucose into the bloodstream, providing fuel for the muscles and brain to respond to a threat. It generally increases alertness rather than reducing it.
Q4. What is a typical daily pattern of cortisol levels in a healthy person?
- A. Highest at night and lowest in the morning
- B. Stable and unchanging throughout the day
- C. Highest in the morning and gradually declining through the day ✓
- D. Highest after meals and lowest during sleep only
Why: Healthy cortisol follows a circadian rhythm, peaking shortly after waking (the cortisol awakening response) to help prepare the body for the day, then gradually declining to its lowest point around midnight.
Q5. Which long-term effect is most associated with chronically high cortisol levels?
- A. Improved immune function
- B. Increased bone density
- C. Suppressed immune function ✓
- D. Faster muscle recovery
Why: Prolonged elevated cortisol can suppress immune responses, contribute to weight gain (especially abdominal fat), impair memory, and weaken bone over time. Short bursts of cortisol are protective, but chronic elevation is harmful.
Module 5
Module 5: Sex Hormones and Reproductive Health
Sex Hormones and Reproductive Health
Knowledge check
Q1. Which hormone is primarily responsible for triggering ovulation in the menstrual cycle?
- A. Estrogen
- B. Luteinizing hormone (LH) ✓
- C. Progesterone
- D. Testosterone
Why: A surge in luteinizing hormone (LH) from the pituitary gland triggers the release of a mature egg from the ovary, which is ovulation.
Q2. Which hormone is produced mainly by the corpus luteum after ovulation and helps prepare the uterine lining for a possible pregnancy?
- A. Follicle-stimulating hormone (FSH)
- B. Progesterone ✓
- C. Prolactin
- D. Oxytocin
Why: After ovulation, the corpus luteum secretes progesterone, which thickens and stabilizes the endometrium so it can support an implanted embryo.
Q3. In males, which hormone is the primary androgen responsible for the development of male secondary sexual characteristics?
- A. Estradiol
- B. Testosterone ✓
- C. Cortisol
- D. Insulin
Why: Testosterone, produced mainly by the Leydig cells of the testes, drives development of male secondary sexual characteristics such as facial hair, deeper voice, and muscle mass.
Q4. Which gland produces the hormones FSH and LH that regulate the ovaries and testes?
- A. Thyroid gland
- B. Adrenal gland
- C. Pituitary gland ✓
- D. Pancreas
Why: The anterior pituitary gland secretes follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which act on the ovaries and testes to regulate reproductive function.
Q5. Which hormone, primarily produced by the ovarian follicles, is responsible for the development of female secondary sexual characteristics?
- A. Estrogen ✓
- B. Progesterone
- C. Human chorionic gonadotropin
- D. Melatonin
Why: Estrogen, produced by developing ovarian follicles, drives female puberty and secondary sexual characteristics such as breast development, widening of the hips, and fat distribution.
Module 6
Module 6: Hormones, Sleep, and Mood
Hormones, Sleep, and Mood
Knowledge check
Q1. Which hormone is primarily responsible for promoting sleep onset in the evening?
- A. Cortisol
- B. Melatonin ✓
- C. Insulin
- D. Adrenaline
Why: Melatonin is produced by the pineal gland in response to darkness and signals the body that it is time to sleep. Its levels rise in the evening and fall in the morning.
Q2. Which hormone is known as the body's primary stress hormone and typically peaks in the early morning?
- A. Oxytocin
- B. Estrogen
- C. Cortisol ✓
- D. Thyroxine
Why: Cortisol is released by the adrenal glands as part of the stress response. It follows a daily rhythm, rising in the early morning to help wake the body and falling through the day and evening.
Q3. Which neurotransmitter is a precursor to melatonin and is also linked to mood regulation?
- A. Dopamine
- B. Serotonin ✓
- C. GABA
- D. Glutamate
Why: Serotonin is converted into melatonin in the pineal gland. Serotonin also plays a major role in regulating mood, so sleep and mood are closely connected through this pathway.
Q4. What is the most common effect of chronic sleep deprivation on the hormone ghrelin?
- A. It decreases ghrelin, reducing hunger
- B. It increases ghrelin, which can raise appetite ✓
- C. It has no effect on ghrelin
- D. It stops ghrelin production entirely
Why: Sleep loss tends to raise ghrelin, the hunger hormone, and lower leptin, the satiety hormone. This combination is one reason people who sleep poorly often feel hungrier and crave high-calorie foods.
Q5. Which hormone release is most associated with deep, slow-wave sleep?
- A. Growth hormone ✓
- B. Prolactin only
- C. Thyroid-stimulating hormone
- D. Aldosterone
Why: Growth hormone is released in pulses, with the largest pulse occurring during early deep (slow-wave) sleep. This is important for tissue repair, growth, and metabolic regulation.
Module 7
Module 7: Hormone Imbalances and Maintaining Balance
Hormone Imbalances and Maintaining Balance
Knowledge check
Q1. Which gland is often called the 'master gland' because it regulates the function of many other endocrine glands?
- A. Thyroid gland
- B. Pituitary gland ✓
- C. Adrenal gland
- D. Pancreas
Why: The pituitary gland releases hormones that control other endocrine glands, such as the thyroid and adrenal glands, which is why it is called the master gland.
Q2. Which hormone is primarily responsible for regulating blood sugar levels by helping cells absorb glucose?
- A. Glucagon
- B. Cortisol
- C. Insulin ✓
- D. Thyroxine
Why: Insulin, produced by the pancreas, signals cells to take up glucose from the blood, lowering blood sugar levels after meals.
Q3. Hypothyroidism is a condition in which the thyroid gland produces too little thyroid hormone. Which of the following is a common symptom?
- A. Unexplained weight loss and rapid heartbeat
- B. Fatigue and weight gain ✓
- C. Heat intolerance and nervousness
- D. Bulging eyes and tremors
Why: Low thyroid hormone slows metabolism, which commonly causes fatigue, weight gain, and cold intolerance. The other options describe hyperthyroidism.
Q4. What is the main role of cortisol, often called the 'stress hormone'?
- A. It lowers blood pressure during sleep
- B. It helps the body respond to stress and regulates metabolism ✓
- C. It stimulates milk production
- D. It triggers muscle growth after exercise
Why: Cortisol, released by the adrenal glands, helps the body manage stress, regulates blood sugar and metabolism, and helps control inflammation.
Q5. Which lifestyle habit is most helpful for supporting healthy hormone balance?
- A. Skipping sleep to maximize productivity
- B. Eating a diet high in refined sugar
- C. Getting regular physical activity and adequate sleep ✓
- D. Avoiding all fats in the diet
Why: Regular exercise and adequate sleep help regulate hormones such as insulin, cortisol, and growth hormone, supporting overall hormonal balance.